When I attempt to enter dates into a datepicker popup field via my automated test, I get form errors on the page when submitting the form, telling me the date is in the wrong format, even though it’s not. I’ve tried different methods of inputting the date into the field but nothing works. I tried ‘click’, ‘clickAt’, and ‘type’ but nothing works. I’ve tried referencing the field via the ‘id’ and ‘xpath’ locators.

If you find yourself saying something like the title of this post, take a deep breath and relax. Do that BEFORE you reach for the keyboard and BEFORE you start typing.
Yes, there are some pretty smart people on this forum. But even so, they/we are not magicians or wizards or gods. We can’t see your code. We can’t see your errors…
Remember: We don’t even know what your application is meant to do even though it might seem perfectly obvious to you.
So relax. Follow the advice below and take…